Some time ago neon lighting was used to tune the interior of a car. It is bright enough, thanks to which even a rather large space is illuminated from even one lamp. However, neon is quite expensive, it is very afraid of mechanical damage, it often burns out when it is turned on and off, and it is also more difficult to install. So I decided to use LED https://www.amazon.com/car-lights-car-led-lights/dp/B09L86JRRM. The standard places for installing additional light in the passenger compartment are considered to be the place under the dashboard and glove box, car seats, doors, door handles. Although, basically, you can highlight anything, it all depends on your imagination.